I added a can of sea foam; but only with 5 gallons of gasoline. I ran the engine 1 1/2 hours and it runs much smoother than before. It has little or no misfiring above 1000 rpms; but idles roughly at 1000 rpms. After that, I now have a new code, P0172. My code reader says "system too rich". What causes this code and what can I do to correct this problem?

Car shut off periodically while driving. When car shut off has odor of gas/metal. Car will restart and may not have any issue with it for a few days then happens. Also having issue with a/c coolant wa...

Yesterday, when arriving at work, my 1998 Volvo S70 T5 started running roughly... then it died completely. Got it started again, but now it idles rough, and pours whitish smoke out of the exhaust. Aft...

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